Add and adapt buflib shrink tests

Change-Id: I8aad86226c9c9b2c04727a3703941615638b3a49

firmware/test/buflib/test_shrink.c

@@ -0,0 +1,56 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Copyright (C) 2011 Thomas Martitz
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU General Public License
+* as published by the Free Software Foundation; either version 2
+* of the License, or (at your option) any later version.
+*
+* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+* KIND, either express or implied.
+*
+****************************************************************************/
+#include <stdio.h>
+#include "core_alloc.h"
+#include "util.h"
+
+/*
+ * Expected output:
+-------------------
+0x602520: val: 1285 (first)
+0x604d48: val:  -32 (<unallocated>)
+0x604e48: val: 1221 (second)
+0x607470: val:  -32 (<unallocated>)
+0x607570: val: 1285 (third)
+-------------------
+*/
+struct buflib_callbacks ops;
+
+int main(void)
+{
+    UT_core_allocator_init();
+
+    int first  = core_alloc("first", 10<<10);
+    int second = core_alloc("second", 10<<10);
+    int third  = core_alloc("third", 10<<10);
+
+    strcpy((char*)core_get_data(second)+0x100, "foobar");
+    core_shrink(second, (char*)core_get_data(second)+0x100, (10<<10)-0x200);
+    core_print_blocks(&print_simple);
+
+    int ret = strcmp(core_get_data(second), "foobar");
+
+    core_free(first);
+    core_free(second);
+    core_free(third);
+
+    return ret;
+}